Sending only men to die does not directly serve that purpose. So it shouldn't matter if women are sent.
Precisely. Not wanting women to serve in combat roles has nothing to do with sexism or chauvinism. It is strictly about the requirements to do the job. If you don't meet the requirements, you're a hindrance, and you endanger both yourself and others. A 90 pound weakling male wouldn't be fit even though he's a man, so it has nothing to do with the notion that women are inferior.
However, the NOW gang has twisted the whole concept by making it a matter of sexism and chauvinism, in the same way that they've sold abortion as being a woman's right to choose, automatically making anyone who's against abortion guilty of sexism when that's not the case nor the point.